By DIANA HEIL | The New Mexican September 30, 2006 When something stumps Dr. Paul Farmer, it often means it’s time to write another book. “I actually write to learn,” he said from his office at Harvard Medical School. Farmer said he figured out a better way to deliver health care to the world’s poor while writing Pathologies of Power: Health, Human Rights, and the New War on the Poor. In 1987, Farmer, an infectious-disease specialist, helped launch Partners In Health, a social justice organization, which worked for